18811033663 has 2 divisors, whose sum is σ = 18811033664. Its totient is φ = 18811033662.

The previous prime is 18811033627. The next prime is 18811033697. The reversal of 18811033663 is 36633011881.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18811033663 - 2²¹ = 18808936511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18811033463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9405516831 + 9405516832.

It is an arithmetic number, because the mean of its divisors is an integer number (9405516832).

Almost surely, 2^18811033663 is an apocalyptic number.

18811033663 is a deficient number, since it is larger than the sum of its proper divisors (1).

18811033663 is an equidigital number, since it uses as much as digits as its factorization.

18811033663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 18811033663 in words is "eighteen billion, eight hundred eleven million, thirty-three thousand, six hundred sixty-three".